At what stage of the lysogenic cycle would a prophage appear?
a. penetration
b. integration
c. attachment
d. replication
e. assembly
b
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The packaging mechanism of T4 DNA involves cutting of DNA from
A) linear genetic elements. B) circular genetic elements. C) DNA concatemers. D) its host cells.
When blood oxygen decreases, what hormone increases red blood cell synthesis by stem cells in the bone marrow?
A. Erthropoietin b. Aldosterone c. Renin d. Antidiuretic hormone (ADH)
Pyelonephritis may result from
A) urethritis. B) cystitis. C) ureteritis. D) systemic infections. E) All of the answers are correct.
How does the toxin from Clostridium tetani produce its action?
A. it fuses irreversibly to neurons, blocking release of acetylcholine at synaptic clefts. B. the smaller polypeptide of its toxin can block the release of inhibitory neurotransmitters by inhibitory neurons in the central nervous system. C. it is a pyrogenic toxin, which triggers a diffused rash and, later, sloughing of skin. D. it destroys tissues, including muscle and fat. E. Antibodies to the toxin bind the neuromuscular junctions in skeletal muscle preventing relaxation.